Thanks for your question. This article contends:

"51% of US smartphone users don’t download apps.

Around 13% of mobile device users in the US download one app per month. Data on the average app downloads per month shows that just 5% of users download eight or more apps during the same period, while 51% of all US smartphone owners don’t download any apps."

https://websitebuilder.org/blog/app-usage-statistics/